USD398645SExpiredUtility

Teaching tool

25
Assignee: TSAO CHIN-CHENPriority: Jan 16, 1998Filed: Jan 16, 1998Granted: Sep 22, 1998
Est. expiryJan 16, 2018(expired)· nominal 20-yr term from priority
Inventors:Chin-Chen Tsao
25
PatentIndex Score
2
Cited by
8
References
1
Claims

Claims

exact text as granted — not AI-modified
The ornamental design for teaching tool, as shown and described.

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